4.6 Article

Spacer Cations Dictate Photoinduced Phase Segregation in 2D Mixed Halide Perovskites

Journal

ACS ENERGY LETTERS
Volume 6, Issue 7, Pages 2499-2501

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01015

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Funding

  1. Division of Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences of the U.S. Department of Energy [DE-FC02-04ER15533]
  2. Division of Materials Sciences and Engineering Office of Basic Energy Sciences of the U.S. Department of Energy [DE-SC0014334]
  3. Patrick and Jana Eilers Graduate Student Fellowship
  4. Forgash Fellowship for Solar Energy Research

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The spacer cation used in 2D Ruddlesden-Popper lead halide perovskites affects the photoinduced phase segregation, with differences observed between using butylammonium (BA) and phenethylammonium (PEA) as spacer cations.
The spacer cation in two-dimensional (2D) Ruddlesden-Popper lead halide perovskites dictates photoinduced phase segregation. Halide ion segregation under steady-state irradiation of single-layer (n = 1) 2D perovskites is seen when butylammonium (BA) is used as the spacer cation, whereas it is essentially absent when BA is replaced with phenethylammonium (PEA).

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